In a scenario where a marketing team is using Google Analytics to optimize their website campaigns, which feature of Google Analytics should they focus on for each specific task?
- Task I: Identifying the age group and interests of the website's most frequent visitors to tailor blog content.
- Task II: Determining whether a recent increase in website traffic is due to a successful social media campaign or organic search.
- Task III: Analyzing which product pages are most visited and the average time spent on these pages.
- Task IV: Tracking the number of users who signed up for the newsletter after a new call-to-action was added.
Select the correct Google Analytics feature for each task.